1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/ioctl.h>
31 #include "sd-messages.h"
32 #include "logind-seat.h"
33 #include "logind-acl.h"
36 #include "path-util.h"
38 Seat *seat_new(Manager *m, const char *id) {
48 s->state_file = strappend("/run/systemd/seats/", id);
54 s->id = path_get_file_name(s->state_file);
57 if (hashmap_put(m->seats, s->id, s) < 0) {
66 void seat_free(Seat *s) {
70 LIST_REMOVE(gc_queue, s->manager->seat_gc_queue, s);
73 session_free(s->sessions);
78 device_free(s->devices);
80 hashmap_remove(s->manager->seats, s->id);
86 int seat_save(Seat *s) {
87 _cleanup_free_ char *temp_path = NULL;
88 _cleanup_fclose_ FILE *f = NULL;
96 r = mkdir_safe_label("/run/systemd/seats", 0755, 0, 0);
100 r = fopen_temporary(s->state_file, &f, &temp_path);
104 fchmod(fileno(f), 0644);
107 "# This is private data. Do not parse.\n"
109 "CAN_MULTI_SESSION=%i\n"
111 "CAN_GRAPHICAL=%i\n",
113 seat_can_multi_session(s),
115 seat_can_graphical(s));
118 assert(s->active->user);
124 (unsigned long) s->active->user->uid);
130 fputs("SESSIONS=", f);
131 LIST_FOREACH(sessions_by_seat, i, s->sessions) {
135 i->sessions_by_seat_next ? ' ' : '\n');
139 LIST_FOREACH(sessions_by_seat, i, s->sessions)
142 (unsigned long) i->user->uid,
143 i->sessions_by_seat_next ? ' ' : '\n');
148 if (ferror(f) || rename(temp_path, s->state_file) < 0) {
150 unlink(s->state_file);
156 log_error("Failed to save seat data for %s: %s", s->id, strerror(-r));
161 int seat_load(Seat *s) {
164 /* There isn't actually anything to read here ... */
169 static int vt_allocate(int vtnr) {
170 _cleanup_free_ char *p = NULL;
171 _cleanup_close_ int fd = -1;
175 if (asprintf(&p, "/dev/tty%i", vtnr) < 0)
178 fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
185 int seat_preallocate_vts(Seat *s) {
192 log_debug("Preallocating VTs...");
194 if (s->manager->n_autovts <= 0)
197 if (!seat_has_vts(s))
200 for (i = 1; i <= s->manager->n_autovts; i++) {
205 log_error("Failed to preallocate VT %i: %s", i, strerror(-q));
213 int seat_apply_acls(Seat *s, Session *old_active) {
218 r = devnode_acl_all(s->manager->udev,
221 !!old_active, old_active ? old_active->user->uid : 0,
222 !!s->active, s->active ? s->active->user->uid : 0);
225 log_error("Failed to apply ACLs: %s", strerror(-r));
230 int seat_set_active(Seat *s, Session *session) {
234 assert(!session || session->seat == s);
236 if (session == s->active)
239 old_active = s->active;
243 session_device_pause_all(old_active);
244 session_send_changed(old_active, "Active", NULL);
247 seat_apply_acls(s, old_active);
249 if (session && session->started) {
250 session_send_changed(session, "Active", NULL);
251 session_device_resume_all(session);
254 if (!session || session->started)
255 seat_send_changed(s, "ActiveSession", NULL);
260 session_save(session);
261 user_save(session->user);
265 session_save(old_active);
266 if (!session || session->user != old_active->user)
267 user_save(old_active->user);
273 int seat_active_vt_changed(Seat *s, int vtnr) {
274 Session *i, *new_active = NULL;
280 if (!seat_has_vts(s))
283 log_debug("VT changed to %i", vtnr);
285 LIST_FOREACH(sessions_by_seat, i, s->sessions)
286 if (i->vtnr == vtnr) {
291 r = seat_set_active(s, new_active);
292 manager_spawn_autovt(s->manager, vtnr);
297 int seat_read_active_vt(Seat *s) {
304 if (!seat_has_vts(s))
307 lseek(s->manager->console_active_fd, SEEK_SET, 0);
309 k = read(s->manager->console_active_fd, t, sizeof(t)-1);
311 log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
312 return k < 0 ? -errno : -EIO;
318 if (!startswith(t, "tty")) {
319 log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
323 r = safe_atoi(t+3, &vtnr);
325 log_error("Failed to parse VT number %s", t+3);
330 log_error("VT number invalid: %s", t+3);
334 return seat_active_vt_changed(s, vtnr);
337 int seat_start(Seat *s) {
344 MESSAGE_ID(SD_MESSAGE_SEAT_START),
346 "MESSAGE=New seat %s.", s->id,
349 /* Initialize VT magic stuff */
350 seat_preallocate_vts(s);
352 /* Read current VT */
353 seat_read_active_vt(s);
360 seat_send_signal(s, true);
365 int seat_stop(Seat *s) {
372 MESSAGE_ID(SD_MESSAGE_SEAT_STOP),
374 "MESSAGE=Removed seat %s.", s->id,
377 seat_stop_sessions(s);
379 unlink(s->state_file);
380 seat_add_to_gc_queue(s);
383 seat_send_signal(s, false);
390 int seat_stop_sessions(Seat *s) {
396 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
397 k = session_stop(session);
405 int seat_attach_session(Seat *s, Session *session) {
408 assert(!session->seat);
411 LIST_PREPEND(sessions_by_seat, s->sessions, session);
413 seat_send_changed(s, "Sessions", NULL);
415 /* On seats with VTs, the VT logic defines which session is active. On
416 * seats without VTs, we automatically activate the first session. */
417 if (!seat_has_vts(s) && !s->active)
418 seat_set_active(s, session);
423 void seat_complete_switch(Seat *s) {
428 /* if no session-switch is pending or if it got canceled, do nothing */
429 if (!s->pending_switch)
432 session = s->pending_switch;
433 s->pending_switch = NULL;
435 seat_set_active(s, session);
438 bool seat_has_vts(Seat *s) {
441 return seat_is_seat0(s) && s->manager->console_active_fd >= 0;
444 bool seat_is_seat0(Seat *s) {
447 return s->manager->seat0 == s;
450 bool seat_can_multi_session(Seat *s) {
453 return seat_has_vts(s);
456 bool seat_can_tty(Seat *s) {
459 return seat_has_vts(s);
462 bool seat_has_master_device(Seat *s) {
465 /* device list is ordered by "master" flag */
466 return !!s->devices && s->devices->master;
469 bool seat_can_graphical(Seat *s) {
472 return seat_has_master_device(s);
475 int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
477 bool idle_hint = true;
478 dual_timestamp ts = { 0, 0 };
482 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
486 ih = session_get_idle_hint(session, &k);
492 if (k.monotonic > ts.monotonic)
498 } else if (idle_hint) {
500 if (k.monotonic > ts.monotonic)
511 bool seat_check_gc(Seat *s, bool drop_not_started) {
514 if (drop_not_started && !s->started)
517 if (seat_is_seat0(s))
520 return seat_has_master_device(s);
523 void seat_add_to_gc_queue(Seat *s) {
529 LIST_PREPEND(gc_queue, s->manager->seat_gc_queue, s);
530 s->in_gc_queue = true;
533 static bool seat_name_valid_char(char c) {
535 (c >= 'a' && c <= 'z') ||
536 (c >= 'A' && c <= 'Z') ||
537 (c >= '0' && c <= '9') ||
542 bool seat_name_is_valid(const char *name) {
547 if (!startswith(name, "seat"))
553 for (p = name; *p; p++)
554 if (!seat_name_valid_char(*p))
557 if (strlen(name) > 255)